gin/v8_isolate_memory_dump_provider.cc

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "gin/v8_isolate_memory_dump_provider.h"
   6
   7 #include "base/strings/stringprintf.h"
   8 #include "base/thread_task_runner_handle.h"
   9 #include "base/trace_event/memory_dump_manager.h"
  10 #include "base/trace_event/process_memory_dump.h"
  11 #include "gin/public/isolate_holder.h"
  12 #include "v8/include/v8.h"
  13
  14 namespace gin {
  15
  16 V8IsolateMemoryDumpProvider::V8IsolateMemoryDumpProvider(
  17     IsolateHolder* isolate_holder)
  18     : isolate_holder_(isolate_holder) {
  19   base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
  20       this, base::ThreadTaskRunnerHandle::Get());
  21 }
  22
  23 V8IsolateMemoryDumpProvider::~V8IsolateMemoryDumpProvider() {
  24   base::trace_event::MemoryDumpManager::GetInstance()->UnregisterDumpProvider(
  25       this);
  26 }
  27
  28 // Called at trace dump point time. Creates a snapshot with the memory counters
  29 // for the current isolate.
  30 bool V8IsolateMemoryDumpProvider::OnMemoryDump(
  31     const base::trace_event::MemoryDumpArgs& args,
  32     base::trace_event::ProcessMemoryDump* process_memory_dump) {
  33   // TODO(ssid): Use MemoryDumpArgs to create light dumps when requested
  34   // (crbug.com/499731).
  35
  36   if (isolate_holder_->access_mode() == IsolateHolder::kUseLocker) {
  37     v8::Locker locked(isolate_holder_->isolate());
  38     DumpHeapStatistics(process_memory_dump);
  39   } else {
  40     DumpHeapStatistics(process_memory_dump);
  41   }
  42   return true;
  43 }
  44
  45 void V8IsolateMemoryDumpProvider::DumpHeapStatistics(
  46     base::trace_event::ProcessMemoryDump* process_memory_dump) {
  47   std::string dump_base_name =
  48       base::StringPrintf("v8/isolate_%p", isolate_holder_->isolate());
  49
  50   // Dump statistics of the heap's spaces.
  51   std::string space_name_prefix = dump_base_name + "/heap_spaces";
  52   v8::HeapStatistics heap_statistics;
  53   isolate_holder_->isolate()->GetHeapStatistics(&heap_statistics);
  54
  55   size_t known_spaces_used_size = 0;
  56   size_t known_spaces_size = 0;
  57   size_t number_of_spaces = isolate_holder_->isolate()->NumberOfHeapSpaces();
  58   for (size_t space = 0; space < number_of_spaces; space++) {
  59     v8::HeapSpaceStatistics space_statistics;
  60     isolate_holder_->isolate()->GetHeapSpaceStatistics(&space_statistics,
  61                                                        space);
  62     const size_t space_size = space_statistics.space_size();
  63     const size_t space_used_size = space_statistics.space_used_size();
  64
  65     known_spaces_size += space_size;
  66     known_spaces_used_size += space_used_size;
  67
  68     std::string space_dump_name =
  69         space_name_prefix + "/" + space_statistics.space_name();
  70     auto space_dump = process_memory_dump->CreateAllocatorDump(space_dump_name);
  71     space_dump->AddScalar(base::trace_event::MemoryAllocatorDump::kNameSize,
  72                           base::trace_event::MemoryAllocatorDump::kUnitsBytes,
  73                           space_size);
  74
  75     auto space_allocated_dump = process_memory_dump->CreateAllocatorDump(
  76         space_dump_name + "/allocated_objects");
  77     space_allocated_dump->AddScalar(
  78         base::trace_event::MemoryAllocatorDump::kNameSize,
  79         base::trace_event::MemoryAllocatorDump::kUnitsBytes, space_used_size);
  80   }
  81
  82   // Compute the rest of the memory, not accounted by the spaces above.
  83   std::string other_spaces_name = space_name_prefix + "/other_spaces";
  84   auto other_dump = process_memory_dump->CreateAllocatorDump(other_spaces_name);
  85   other_dump->AddScalar(base::trace_event::MemoryAllocatorDump::kNameSize,
  86                         base::trace_event::MemoryAllocatorDump::kUnitsBytes,
  87                         heap_statistics.total_heap_size() - known_spaces_size);
  88
  89   auto other_allocated_dump = process_memory_dump->CreateAllocatorDump(
  90       other_spaces_name + "/allocated_objects");
  91   other_allocated_dump->AddScalar(
  92       base::trace_event::MemoryAllocatorDump::kNameSize,
  93       base::trace_event::MemoryAllocatorDump::kUnitsBytes,
  94       heap_statistics.used_heap_size() - known_spaces_used_size);
  95
  96   // Dump statistics of the heap's live objects from last GC.
  97   std::string object_name_prefix = dump_base_name + "/heap_objects";
  98   bool did_dump_object_stats = false;
  99   const size_t object_types =
 100       isolate_holder_->isolate()->NumberOfTrackedHeapObjectTypes();
 101   for (size_t type_index = 0; type_index < object_types; type_index++) {
 102     v8::HeapObjectStatistics object_statistics;
 103     if (!isolate_holder_->isolate()->GetHeapObjectStatisticsAtLastGC(
 104             &object_statistics, type_index))
 105       continue;
 106
 107     std::string dump_name =
 108         object_name_prefix + "/" + object_statistics.object_type();
 109     if (object_statistics.object_sub_type()[0] != '\0')
 110       dump_name += std::string("/") + object_statistics.object_sub_type();
 111     auto object_dump = process_memory_dump->CreateAllocatorDump(dump_name);
 112
 113     object_dump->AddScalar(
 114         base::trace_event::MemoryAllocatorDump::kNameObjectsCount,
 115         base::trace_event::MemoryAllocatorDump::kUnitsObjects,
 116         object_statistics.object_count());
 117     object_dump->AddScalar(base::trace_event::MemoryAllocatorDump::kNameSize,
 118                            base::trace_event::MemoryAllocatorDump::kUnitsBytes,
 119                            object_statistics.object_size());
 120     did_dump_object_stats = true;
 121   }
 122
 123   if (process_memory_dump->GetAllocatorDump(object_name_prefix +
 124                                             "/CODE_TYPE")) {
 125     auto code_kind_dump = process_memory_dump->CreateAllocatorDump(
 126         object_name_prefix + "/CODE_TYPE/CODE_KIND");
 127     auto code_age_dump = process_memory_dump->CreateAllocatorDump(
 128         object_name_prefix + "/CODE_TYPE/CODE_AGE");
 129     process_memory_dump->AddOwnershipEdge(code_kind_dump->guid(),
 130                                           code_age_dump->guid());
 131   }
 132
 133   if (did_dump_object_stats) {
 134     process_memory_dump->AddOwnershipEdge(
 135         process_memory_dump->CreateAllocatorDump(object_name_prefix)->guid(),
 136         process_memory_dump->CreateAllocatorDump(space_name_prefix)->guid());
 137   }
 138 }
 139
 140 }  // namespace gin